Method of forming pipe-joints.



No. 800,924. PATENTED 'OCT. 3, 1905.

M. KRONAUBR.

METHOD OF FORMING PIPE JOINTS.

APPL'IGATION FILED MAR.16, 1904.

UNITED STATES PA rnNT onnien.

MAX KRONAUER, OF PATERSON, NEW JERSEY, ASSIGNOR TO A. GILLESPIE COMPANY, A CORPORATION OF NEIV JERSEY.

METHOD OF FORMING PIPE-JOINTS.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed March 16, 190 1. $eria1N0. 198,526.

To (all 1071 0110 it 'nuty (Jo/warn.-

Be it known that I, h IAX KRONAUER, a citizen of the Republic of Switzerland, residing in Paterson, county of Passaic, and State of New Jersey, have invented certain new and useful Improvements in Methods of Forming Pipe-Joints; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to the construction of systems of piping; and it has reference particularly to the formation ofjoints between sections of, especially, sheet steel 01' iron piping of relatively large diameter.

The prevailing method of joining together adjacent sections of steel piping consists in inserting the end of one section into that of the other and then riveting the two together. In order to accomplish this, it is necessary that every other section be smaller in diameter than its neighbors or that each section be made of tapering form, so that adjacent sections may be telescoped. This and other methods of forming the joints are subject to one or more of the following objections: that allowance is not made for free expansion and contraction in the system under variations in temperature, with the consequence that damage results at one point or another in the system, or that undesirable obstructions are formed (as by the overlapping of the ends of the sections and by the rivets holding them together) on the inside of the piping, so that the flow of the liquid therethrough is not onlyimpeded, owing to a reduction of considerable proportions in the inner diameter at the joints, but by the formation of eddies produced by such obstructions, or that large quantities of lead are necessary to be used to calk the joint, with the consequence that if the system is contiguous to some electric conductor electrolytic deterioration sooner or later renders thejoint leaky, or that the parts are of such nature as toinvolve difliculty and inconvenience in assembling and instability of adjustment.

The object of the present invention is to overcome the aforementioned and other objections attendant upon present methods of forming joints in systems of piping.

In carrying out my invention I first insert the end of each pipe in the groove of an annularly-grooved annular metallic part having an outwardly-projecting rib or flange. I then compress the groove portion of said ring so as to clamp the pipe-section end therein. I then bring the pipe-sections together until said annular parts abut against each other, and then, finally, secure the flanges of said annular parts together along a line substantially parallel with the outer surface of the pipe, but suflicientl y remote therefrom so that under a longitudinal strain tending to separate the pipe-sections the body comprising the united annular parts above mentioned will yield.

My invention consists in the method above broadly delineated of forming a joint between pipe-sections.

I will describe the preferred manner of carrying out the method with reference to the accompanying drawings, wherein- Figure 1 is a transverse sectional view of a system of piping having joints formed in ac cordance with my method, the section being taken at one side of the joint. Fig. 2 is a longitudinal sectional view of said system of piping on the line A B in Fig. 1. Fig. 3 is a view showing in side elevation what is shown in section in Fig. 2. Fig. 4 is a fragmentaryview, partly in transverse section, of one of the annular parts above referred to. Fig. 5 is a view in front elevation of what is seen in Fig. I. Fig. 6 is a fragmentary view, partly in transverse section, illustrating in detail how the uniting of each of the abovementioned annular parts with the end of the pipe-section is accomplishechthe section being also taken on the line A B in Fig. 1; and Fig. 7 is a view of what is shown in Fig. 3 as it appears from the position at right angles to the position from which the parts are viewed, as in said Fig. 3.

It is preferred that the pipe-sections be of that form wherein two semicylindrical shells b are connected at their meeting edges by lockings-bars c, which are clamped in place after said edges have been peened up or expanded. The reason why this form of pipesection is preferable is that it is one in which the ends are circular, overlapping belng avoided. It will be understood that the locking-bars 0 are not extended to the same length as each pipe-section, but are cut off short thereof at the ends, as best seen in Fig. 2. Each annular part(marked (4) consists of a metallic ring (0, preferably of rolled steel, having an outwardly-projecting flange 6. One face of the annular part a is perfectly plane or flat, while from its opposite face in the ring portion thereof project two annular jaws c, forming an annular channel or groove (Z. In the flange l) is formed a series of rivet-holes a. Each of these annular parts is fitted to the end of one of the two pipe-sections to be joined, whereupon suitable dies are employed to press the jaws together, and thus clamp the annular part (it to the end of the pipe-section. To insure stability of the joint thus formed between the annular part a and the end of the pipe-section before they are assembled, the latter has its edge peened up or expanded, as at e in Fig. '7, so that after the pressing together of the jaws c the joint will be substantially a dovetailed joint. The pipe-sections having thus attached the annular parts a are thereupon brought together until the fiat or plane faces of said parts a abut squarely against each other, whereupon the rivet-holes c of the two parts (4 having been made to register rivets (Z are passed through said holes and made to clamp said. parts to together.

The cutting away of the ends of the locking-bars, as above stated, is of course done to accommodate the parts a. They are therefore not cut away so far in practice as to leave any greater openings between the edges of the semicylindrical shells going to make up each pipe-section than is absolutely necessary; but such openings as are left at these points after the compression of the jaws 0 into place may be stopped up or calked by lead or in any other suitable manner, as at g in Figs. 6 and 7. The joint thus formed overcomes all the objections hereinbefore referred to. The body comprising the annular parts a is one whose outer annular portion is, in effect, a substantial integral element, while its inner annular portion may be regarded as being divided to permit of a certain yielding with and under the influence of the adjacent edge portions of the pipe-sections as they move to and from each other under the effects of longitu dinal expansion and contraction in the pipesections. lVloreover, it requires no operation from the inside of the pipe-sections after assemblage. Again, the series of flanges 7) throughout the system not only gives strength and rigidity thereto, but acts as supports to the pipe-sections both before and after assemblage.

The laying of pipe systems of the kind particularly referred to is usually done during the warmer periods of the year, and in so far as that adaptation of my invention which is particularly described above concerned it is of peculiar value to follow this custom, for then the pipe-sections will be at their maximum length and each pair of annular parts a face to face in all portions of the adjacent surfaces thereof, free to separate in those portions thereof which are in alinement with the pipe-sections when reduction of temperature and consequent contraction come.

eference is hereby made to a copending application, Serial No. 198,525, filed March 16, 1904, for a patent for an improvement in a pipe-joint forming a product of the hereindescribed method.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The method of joining the adjoining ends of adjacent sections of a system of piping which consists in inserting the end of each pipe-section in the groove of an annularlygrooved annular part, then compressing the grooved portion of said part so as to clamp the latter to the pipe end, then bringing said ape-sections together, with said annular parts thus attached, end to end and while the pipesections are expanded to approximately a degree corresponding to their maximum natural degree of expansion, and then securing said annular parts together along a line which is substantially concentric, but not alined, with the walls of said pipe-sections, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 19th day of February, 1904.

MAX KRONAUER.

\Vitnesses:

JonN W. STEWARI), luuxu DuIs STEWARD. 

